Granted Patent
Utility
US 4,462,223 · App. 06/479,495
Method and means for preventing coupling freezing
Inventor:
Warren E. Perkins
Patented Case
View Patent ↗
Granted: Jul 31, 1984
Filed: Mar 28, 1983
Inventor
Warren E. Perkins
Assignee (at issue)
CRYO.sub.2 Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.